Marijuana, aka cannabis, pot, weed, dope, MJ (Mary-Jane), is classified as a Schedule I Controlled Substance by the Controlled Substances Act of 1970. Some states have decriminalized marijuana and some have adopted medical marijuana programs, allowing the possession of a given amount of usable marijuana (1-24 ounces) and marijuana plants (7-15 plants), which varies from state-to-state. Marijuana is not physically addictive, though some people may need rehab to help quit. Detox from marijuana is rarely seen, unless the user has other drug dependencies or is otherwise suffering from withdrawal.